Improved screw-gutting die-plate



screw., C, the shank of which isprovided A "Ihe pinion-cis anni l can.

TfoM .snnnwsunr or brew-Yoeri,v

`Lette/rs Patent No. 95,154,

dated September 21, 1869.

Vnvrpnovsn SCREW-cumin@ D13-PLATE.

The Schedule referred to in these Letters Patent and making part of thesame.v

To all whom it may concern:

Be itlmown that I, TOM Snnewsnunv, of the city, county, and State of New York, have invented `a new and improved `Expanding Die; `and I do hereby declare the following to be a full, clear, and exact description thereof, which will enable those skilled in the art to make and use the same, reference being had to the accompanying drawing, forming part of this specification, in which drawing-'- Figur'el represents a sectional face view of my invention.

Figure 2 is a .transversesection of the same.

Similarletters indicate corresponding parts.

This invention consists in the arrangement of an annular cam, fitting between two shoulders or projections on each die, in such a manner, that by turning said annular cam, the, dies 'are carried in or out simultaneously, thereby enabling the operator to expand the dies, and release the work instantaneously, and

` at the saine time `,said 4dies are held iirmly in position by the annular cam, being prevented from moving in y either direction by their `shoulders or projections,

while the screw to which the dies are attached,I- (for a purpose hereinafter described,) movesfreely through `the pinion, and along'its fastening-screw, by means of a longitudinal slotl With said annular calnand dies I have combined adjusting-screws, which are provided with two heads or projections, bearing from opposite sides against the cam,k and` furnished Vwith pinions, which gear in an annular rack, in such a manuel-,that by turning one ot' the pinions, the several dies are'moved in or out simultaneously, and retained in a concentric position, without being thrown out oi: 'gear with or detached from the annular cam.

In the drawingy 'lhe letter A designates a chuck, which is provided with a central aperture, a'.

' From this aperture radiates a series of grooves,.b,

`which form theguidcs for the dies B.

`In the outer end of each of these dies is tapped a with two heads or projections, 'c c', which vstraddle au annular cam, D, so that one ot' said projections4 bears on the inner, and the otheron the outer edge of thc'cam, as shown inthe drawing. 'p 4 The annular canil) is situated in a cavity iu the `body or thc chuck, and it is'provided, at its inner edge, with a series oi' cogs, d,`which gear into a pinion, c, so that by `turning said pinion, the annular cani is caused to slide in its' groove, and, by the action ot said cain4 on the proiectiops c.c',"tl1cdies` are expanded or contracted simultaneously. mounted on a spindle, which-passes transversely through the body ot' the clnick,-and is prorided'with a square or flattened end, to receive a 'gear with wrench `or key, by means of which the requiredl mo; tion is"in'1p`arted to the pinion and annular cam.

The projections c c hug the annular cam closely,

so that the diesrare firmly retained in position, in

whatever position said cam may be brought, and the cam is so shaped, that by turning the. pinion e in. one direction, the dies will be contracted, tocut a thread of' the required size, and by turning said pinion iin the opposite direction, the dies will be expanded, so as to release the wo1'k, .and enable the operator to put in a fresh blank without loss of time, or without the necessity of turning the chuck backward.

If the chuck is to be used for cutting threads on blanks or pipes of a uniform size, the projections'c c', instead of being attachedhto screws C, will be attached to the dies themselves, and the screws can be dispensed with.

The screws C serve to adjust the dies for different sizes of blanks or pipes, and, to eifect this purpose, they are provided with pinious fwhich gear into an annular rack, g, situated in a suitable groove in the body of the chuck.

Said pinions are fastened to the shanks ofthe screws C by setescrews li., the inner ends ot`which catch in grooves in the shanks, so that thgy do not prevent the screws from moving in and out in a radial direction, while they compel said screws to revolve with the pinions.

The-pinionsf have central openings, in which the shanks of the screws G have their play. These openings allow the radiation of the screws, While their rotation is'caused by the pinions,tl1rough the medium of set-screws h, as previously described.

lhe screws are thus guided in their radiations, in a convenient and economical manner.

lBy turning one of the pinions, therefore, all the dies are moved in or out simultaneously and concentrically, while, at the same time, said dies remain in the annular cam,v so that they can be `expanded and contracted instantaneously and independent of the size to which the dies may have been adjusted.v

'What I claim as new, and desire to secure by Iletters Patent, is

1/ 1. The arrangement ofthe pinion c, annular cani D, shoulders c c', and reciprocating screw C, in the manner and for the purpose specified. i

2. 'Ihe combination, in the same screw-cutting diepiate, of the device above described, for opening and closing the threaders, and the swivclled screw C, pinions f, rack g, and set-screw h., for adjusting the throw of the cutters to bolts of different size, `all'coilstructcd andl arranged together, in the manner described.

Witnesses: y TOM SHRltWSB URY, ',W.HAUF1;, l y

Ii. KAsuENHUBun. 

